Recently installed dynamic windows in the CN Tower observation deck include Prel-Shade Thermochromic Glass, from Suntuitive.
The dynamic glass, which was used in floor-to-ceiling windows, is sun-responsive and gradually darkens as the sun heats it. The glass darkens in proportion to the sun’s intensity to produce a reduction of heat and glare inside the building. As the sun’s intensity wanes, the glass transitions back to a clear state.
The glass allows the CN Tower observation deck to remain comfortable and offer clean views regardless of weather, temperature, or time of day.